How can I select all creased edges with specific weight at once, can be with python
AFAIK There isn't a command for this, but here is a simple script which selects all Edge Creases with values above 0.5:

import bpy

obj = bpy.context.object
me = obj.data

bpy.ops.object.mode_set(mode='OBJECT')

for e in me.edges:
    if e.crease &gt; 0.5:
        e.select = True
        print (e.crease)

bpy.ops.object.mode_set(mode='EDIT')




Bmesh module solution (avoids toggling into Object Mode):

import bpy
import bmesh

obj = bpy.context.object
me = obj.data
bm = bmesh.from_edit_mesh(me)
cr = bm.edges.layers.crease.verify()

me.show_edge_crease = True

for e in bm.edges:
    if (e[cr] &gt; 0.5):
        e.select = True
        print(e[cr])

bmesh.update_edit_mesh(me, False, False)